INAx290 2.7-V to 120-V, 1.1-MHz, Ultra-Precise, Current-Sense Amplifier

1 Features

• Wide common-mode voltage:

– Operational voltage: 2.7 V to 120 V

– Survival voltage: −20 V to +122 V

• Excellent CMRR:

– 160-dB DC

– 85-dB AC at 50 kHz

• Accuracy

– Gain:

• Gain error: ±0.1% (maximum)

• Gain drift: ±5 ppm/°C (maximum)

– Offset:

• Offset voltage: ±12 µV (maximum)

• Offset drift: ±0.2 µV/°C (maximum)

• Available gains:

– A1 devices: 20 V/V

– A2 devices: 50 V/V

– A3 devices: 100 V/V

– A4 devices: 200 V/V

– A5 devices: 500 V/V

• High bandwidth: 1.1 MHz

• Slew rate: 2 V/µs

• Quiescent current: 370 µA (per channel)

2 Applications

• Active antenna system mMIMO (AAS)

• Macro remote radio unit (RRU)

• 48-V rack server

• 48-V merchant network & server power supply

• Test and measurement

SAR

ADC

IN+

IN±

OUT

VCM

+

±

Buffer

Current

Feedback

VS

GND

RL

R1

R1

Bias

Load

RSENSE

ISENSE

INA290 (single channel)

INA2290 (dual channel)

INA4290 (quad channel)

Typical Application

3 Description

The INAx290 is an ultra-precise, current-sense

amplifier that can measure voltage drops across shunt

resistors over a wide common-mode range from 2.7

V to 120 V. The ultra-precise current measurement

accuracy is achieved thanks to the combination of an

ultra-low offset voltage of ±12 µV (maximum), a small

gain error of ±0.1% (maximum), and a high DC CMRR

of 160 dB (typical). The INAx290 is not only designed

for DC current measurement, but also for high-speed

applications (such as fast overcurrent protection, for

example) with a high bandwidth of 1.1 MHz (at gain of

20 V/V) and an 85-dB AC CMRR (at 50 kHz).

The INAx290 provides the capability to make ultra-

precise current measurements by sensing the voltage

drop across a shunt resistor over a wide common-

mode range from 2.7 V to 120 V. The INAx290

devices come in highly space-efficient packages.

The single-channel INA290 device is featured in the

SC-70 package, the dual-channel INA2290 device

is available in the MSOP-8 package, and the quad-

channel INA4290 device is available in the 4 mm x 4

mm QFN package.

The INAx290 operates from a single 2.7-V to 20-V

supply with the single channel device only drawing

370-µA supply current per channel (typical). The

devices are available with five gain options: 20 V/V,

50 V/V, 100 V/V, 200 V/V, and 500 V/V. The low offset

of the zero-drift architecture enables current sensing

with low ohmic shunts as specified over the extended

operating temperature range (−40°C to +125°C).

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

INA290

SC-70 (5)

2.00 mm × 1.25 mm

INA2290

VSSOP (8)

3.00 mm × 3.00 mm

INA4290

QFN (16)

4.00 mm × 4.00 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

INA290, INA2290, INA4290

SBOS961C – JUNE 2020 – REVISED JUNE 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.